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زمینشناسی و معدن::
فرسایش فرورانشی
Subduction erosion instead of accretion Sedimentary accretionary wedges occur in many subduction zones including large portions of the Gulf of Oman (Makran subduction zone, Fig. 5.16), Sumatra, SW Japan, and in smaller areas of western North America and the Lesser Antilles (Fig. 7.13).
Many other subduction zones are characterized by the opposite process, subduction erosion.
During subduction erosion, rock material is scraped off from the bottom of the upper plate and transported downward with the subducting plate.
Subduction erosion transfers a considerable amount of sediment from the surface to greater depths.
In places where subduction erosion occurs, the outer ridge is not a significant feature because sedimentary material does not accumulate in an accretionary wedge.
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